Migrate tests for initializing formals

pkg/dev_compiler/test/not_yet_strong_tests.dart

 import 'dart:collection';
 
 /// The set of tests that are not yet strong mode safe.
 final notYetStrongTests = new HashSet<String>.from([
   'language/abstract_exact_selector_test_01_multi',
   'language/abstract_factory_constructor_test_00_multi',
   'language/abstract_getter_test_01_multi',
   'language/abstract_runtime_error_test_01_multi',
   'language/abstract_runtime_error_test_02_multi',
   'language/abstract_runtime_error_test_03_multi',
@@ skipping 2289 matching lines @@
   'language/field6_negative_test',
   'language/field6a_negative_test',
   'language/field_method4_negative_test',
   'language/function_type_alias_test',
   'language/function_type_parameter2_negative_test',
   'language/function_type_parameter_negative_test',
   'language/getter_declaration_negative_test',
   'language/getter_override2_test_00_multi',
   'language/getters_setters_test',
   'language/import_combinators_negative_test',
+  'language/initializing_formal_type_test',
   'language/inst_field_initializer1_negative_test',
   'language/instance_call_wrong_argument_count_negative_test',
   'language/instance_method2_negative_test',
   'language/instance_method_negative_test',
   'language/interface2_negative_test',
   'language/interface_injection1_negative_test',
   'language/interface_injection2_negative_test',
   'language/interface_static_method_negative_test',
   'language/interface_static_non_final_fields_negative_test',
   'language/is_not_class1_negative_test',
@@ skipping 101 matching lines @@
   'lib/html/mutationobserver_test',
   'lib/html/postmessage_structured_test',
   'lib/html/resource_http_test',
   'lib/html/transferables_test',
   'lib/html/webgl_1_test',
   'lib/html/wrapping_collections_test',
   // TODO(jmesserly): these are both under "dart:html" as well.
   'js_test',
   'js_util_test'
 ]);